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首页> 外文期刊>Separation and Purification Technology >Effect of silver ions coordination on morphology and performance of PES/PVP composite membrane in facilitated transport of ethylene
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Effect of silver ions coordination on morphology and performance of PES/PVP composite membrane in facilitated transport of ethylene

机译：银离子配位对PES / PVP复合膜在乙烯促进运输中形态和性能的影响

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摘要

Structural and permeation properties of PES/PVP electrolyte composite membranes including association and dissociation behavior of silver nitrate salt within the polymer structure, structural situation of electron donor groups of membranes, surface and structural charge of membranes, crystalline variation of membrane active layer before and after salt addition and permeation properties of these membranes at different pressures including low pressures were evaluated. Structural evaluation through FTIR analysis revealed that the distributional condition of carrier agents is affected by increasing the AgNO3 concentration. The efficiency of carriers for ethylene transportation is decreased by salt addition at molar concentrations more than 25%. However, according to the results obtained from zeta potential experiment, increasing the salt concentration enhances the surface and structure charge of membranes. Due to the salt crystals formation, the ascending trend of active layer crystallinity stopped at a salt molar concentration more than 25%. These physical and chemical reactions in the active layer structure caused the ethylene selectivity of final membranes to decrease at a salt molar concentration being more than 25%. The separation efficiency of a membrane with the AgNO3 concentration of 25% was the most efficient situation. Adding a very thin and flexible PDMS layer on the surface of PES/PVP membrane in order to increase the real and ideal ethylene selectivity in the separation process was effective. Moreover, blending AgBF4 and AgNO3 salts was a new method for selectivity increament, which was applied in this research.
机译：PES / PVP电解质复合膜的结构和渗透性能，包括硝酸银盐在聚合物结构内的缔合和解离行为，膜电子给体基团的结构情况，膜的表面和结构电荷，膜活性层前后的结晶变化评估了这些膜在不同压力（包括低压）下的盐分添加和渗透性能。通过FTIR分析的结构评价表明，载体试剂的分布条件受AgNO 3浓度增加的影响。摩尔浓度超过25％时加盐会降低乙烯运输载体的效率。然而，根据从ζ电势实验获得的结果，增加盐浓度可增强膜的表面和结构电荷。由于盐晶体的形成，在盐摩尔浓度大于25％时，活性层结晶度的上升趋势停止。活性层结构中的这些物理和化学反应导致盐浓度超过25％时，最终膜的乙烯选择性降低。 AgNO3浓度为25％的膜的分离效率是最有效的情况。在PES / PVP膜的表面添加非常薄且柔韧的PDMS层以提高分离过程中真实和理想的乙烯选择性是有效的。此外，将AgBF4和AgNO3盐掺混是一种用于选择性消色剂的新方法，该方法已在本研究中得到应用。

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